Elastic rebound theory states that rocks under stress will strain and then “rebound” back after plates slide past each other. (this causes earthquake and possibly tsunami’s) Earthquake focus and epicenter Focus: area where fault slip occurred. Epicenter: point on earth’s surface above focus. ...
EARTHQUAKES Earthquakes An earthquake is the vibration of Earth produced by the rapid release of energy Focus and Epicenter • Focus is the point within Earth where the earthquake starts. • Epicenter is the location on the surface directly above the focus. Faults • Faults a...
2、rength of the rock is exceededRupture occurs and the rocks quickly rebound to an undeformed shapeEnergy is released in waves that radiate outward from the faultThe Focus and Epicenter of an EarthquakeThe point within Earth where faulting begins is the focus, or hypocenterThe point directly ab...
英文：历史上的地震earthquakes in history AnearthquakeisasuddenshakeoftheEarth'scrustcausedbythetectonicplatescolliding.Thevibrationsmayvaryinmagnitude.Theundergroundpointoforiginoftheearthquakeiscalledthe"focus".Thepointdirectlyabovethefocusonthesurfaceiscalledthe"epicenter".Earthquakesbythemselvesrarelykillpeopleor...
The point where the energy is released is called the focus and the focal depth is the depth beneath the earth's surface where the energy release originates. The epicenter is the point on the earth's surface directly above the focus. From here, the energy released spreads out in rings ...
focus. In about 75% of earthquakes, the focus is in the top 10 to 15 kilometers (6 to 9 miles) of the crust.Shallow earthquakescause the most damage because the focus is near where people live. However, it is the epicenter of an earthquake that is reported by scientists and the ...
In Table I the authors give a list of known deep-focus earthquakes in the eastern Mediterranean. Fig. 1 shows that their epicenters generally lie in the zones of active volcanoes, as in the regions surrounding the Pacific Ocean; however, their coincidence with positive gravity anomalies is ...
If the earthquake location is to be shown in map view, it’s often more convenient to plot the point on the ground surface directly above the earthquake focus—a point called the earthquake epicenter. Notice again in Figure 7.4 that the epicenter of an earthquake doesn’t correspond with the...
Deep focus earthquakes between 300 and 700 km confined to convergent plate margins intensity destructive power, of an earthquake is an evaluation of the sever- ity of ground motion at a given location. 1) the total amount of energy released, (2) the dis- tance from the epicenter, and (3...
The underground point where the earthquake rupture begins is thefocusor hypocenter. Theepicenterof an earthquake is the point on the ground directly above the focus. Earthquakes rupture a large zone of a fault around the focus. This rupture zone may be lopsided or symmetrical. Rupture may spread...